*INSULATION CO-ORDINATION *


~Power systems have equipment operating at different voltage levels and each has a different voltage with stand level.

~  There are different types of protective equipment to provide protection against over voltage.

~  All of this needs to be coordinated.  This is called emulation coordination.  The following issues are looked at in Isolation Co-ordination? 

 1.To study the possibility of over voltage coming from lightning or any other way.  

2 Use of appropriate protective device against over voltage surge. 

 3. Keep the protective device in the system in such a way that the protection is not damaged.  

~To do this, the insulation strength of lines, switch gears, transformers, machines, etc., 

~and the characteristic of protective devices such as road gap, lightning arrester, are properly coordinated. 

~ Thus the ability of equipment to withstand voltage impulses and to properly coordinate the protection characteristic of a surge arrester is called insulation coordination.  

~ contains an equipment that is protected against overvoltage by means of a lightning arrester.  

~ the emulation characteristic of protective devices and equipment. 

~ The characteristic curve of the protective device is decimal from Q.  

~While the characteristic curve of the equipment is decimal from P. 

~ From the characteristic it is known that the characteristic of the emulation of the equipment is much higher than the characteristic of the protective device.

~ This means that when the overvoltage occurs, the lightning arrester will spark over at a voltage lower than the tolerable voltage level of the equipment.  .